Add `Options` / `initial_options` validation

Suggestion raised in: https://github.com/slackapi/python-slack-sdk/issues/1509

Behavior:
initial_options options must contain an exact match of options provided, or users experience issues with properly updating forms. Suggestion has been raised to update this SDK to notify developers when an option provided does not exactly match an initial_options selection.

Category (place an x in each of the [ ])

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.models (UI component builders)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.scim (SCIM API client)
• slack_sdk.rtm (RTM client)
• slack_sdk.signature (Request Signature Verifier)

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

Beginne in slack_sdk.models und finde die Definitionen der UI-Komponenten für Options und initial_options. Lies das Verhalten der umgebenden Modelle, um zu bestimmen, wie Optionswerte dargestellt werden, und füge anschließend eine Validierung auf exakte Übereinstimmung hinzu und überprüfe, dass Nichtübereinstimmungen an SDK-Nutzer gemeldet werden.